CVE-2026-59153High▾ TwilightAnki's local HTTP server does not sufficiently validate requests
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.2%
0.2% → 0.3%
Anki launches a local HTTP server to serve media files and web pages for parts of its interface. The server fails to validate requests in the following ways:
This allows malicious websites to exfiltrate local files given a known path.
The severity varies by browser because of Private Network Access (PNA), a newer spec that restricts web pages from making requests to localhost/local network addresses:
Chrome/Chromium (including Edge, Brave): Largely protected, as Chrome has implemented PNA restrictions for several years and now puts local network access behind a permission prompt. Safari: Hasn't implemented PNA yet, though macOS has some OS-level protections. Firefox: Most vulnerable — hasn't implemented PNA yet, though it's reportedly planned for Firefox 151.
The issue was fixed as of Anki 25.09.3
aqt < 25.9.3Upgrade to a patched release:
aqt 25.9.3Connected by shared product, vendor, weakness, or advisory.
GHSA-869j-r97x-hx2gHighAnki's local HTTP server does not sufficiently validate requests
CVE-2026-58266Medium· 6.5Anki: User scripts in iframes have access to the internal Anki API
GHSA-cw6h-ffmh-x6vhMedium· 6.5Anki: User scripts in iframes have access to the internal Anki API